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4-МПП
para-Methylphenylpiperazine (pMPP; code name PAL-233), or 4-methylphenylpiperazine (4-MPP or 4-Me-PP), is a designer drug and monoamine releasing agent of the phenylpiperazine family. It is a serotonin releasing agent, with an EC50Tooltip half-maximal effective concentration of 220 nM in rat brain synaptosomes, and was inactive in the case of norepinephrine and dopamine (EC50 = >10,000 nM and >20,000 nM, respectively). It shows very low potency as a dopamine reuptake inhibitor, with an IC50Tooltip half-maximal inhibitory concentration of 9,523 nM, whereas serotonin and norepinephrine were not reported. Possible activities at serotonin receptors have not been reported.